Cognomen 外尔 (外尔 
, Weyl 
) , in all the world, is quite a rare surname. The surname 外尔 is habitual in Western Europe, particularly Germany, where it is a rare surname, France, and Netherlands. Not in comparison with a country's population, this name is the most popular in Germany, France, and the United States. Very seldom, 外尔 is the forename as well as the last name.